Digital steganography, a set of algorithmic techniques for hiding data in files, is often used to hide text messages (or other digital content) within the bits of an image. In contrast to cryptography, steganography allows to hide the very fact that you are trying to hide something, an aspect that makes it really desirable for hidden communications or classified information leakage.

On Opacity consists on a list of portraits of clients of banks from tax heaven countries. This series of portraits was generated making use of these steganographic techniques, and reflects on the opacity of information in the financial sector caused by bank secrecy policies.